Breech-block mechanism



C. MIRMILLO. s. E. HAYES/GUARDIAN.

BREECH BLOCK MECHANISM.

APPLICATION FILED AUGJG, 1920 1,882,796, Patented June 28, 1921.

2 SHEE S-SHEET l.

C'. MIRMILLO.

s. E. muss, GUARDIAN. B REEC H BLOCK MECHANISM. APPLECATION FILED AUG.I6, 1926. I I

' Patented Jl1fl628, 1921.

2 SHEETS-SHEET 2';

Gnome UNITED, STATES PATENT OFFICE.

CHARLES MIRMILLO, 0F OAKLAND, CALIFORNIA, BY SARAH E. HAYES, GUARDIAN,OF OAKLAND, CALIFORNIA.

BREECH-BLOCK MEOHAN ISM.

Specification of Letters Patent.

Patented June 28, 1921.

To all whom it may concerm Be it known that SARAH E. HAYES is a citizenof the United States, residing at Oakland, in the county of Alameda,State of California, and the duly-appointed guardian of CHARLESMIRMILLO, who has invented certain new and useful Improvements inBreech-Block Mechanisms, of which the following is a specification.

This invention relates to improvements in breech block mechanisms,especially for heavy artillery, the principal object of the inventionbeing to provide a block which has a greater depth than those now used,thus allowing a heavier charge to be placed in the gun.

Another object is to provide the block with a simple means for guidingand maintaining it in position.

The above and other objects are accomplished by means of such structureas will appear by a perusal of the following specification taken inconnection with the accompanying drawings, in which- Figure 1 is a sideelevation of the cannon.

Fig. 2 is a top plan view thereof.

Fig. 3 is a sectional view taken on a line 33 of Fig. 1.

Fig. 4 is a section taken on a line 44 of Fi 2.

l leferring to the characters of reference in the drawings, the numeral1 denotes the barrel carriage on which is mounted the barrel 2. Towardthe breech of the barrel is pivoted an arm 3 as at 4, at the rear end ofwhich is pivoted a bracket 5 carrying the breech block 6 thereon.

Fixed on each side of the bracket 5 are grooved guides 7 engaging tracksor guide bars 8 formed with the carriage 1 and curved radial with thepivotal connection 4 of the arm 3, thus allowing the block to be swungabout its pivotal connection with the arm 3 and insuring that when againraised it will be in proper alinement;

The usual fastening or securing mechanism is employed in the block.Vertical movement of the barrel 2 is provided for by means of suitablegearing 9and horizontal swivel movement by means of suitable gear ing10. A suitable recoil mechanism is provided, which consistsof parallelcylinders 11 in which are springs 12, the barrel having arms 13projecting into the plane of the cylinders and bearing against thesprings. In the block sleeve 6 is a block 14 slidable therein andadapted to be projected or slid into the breech of the barrel a desireddistance by means of gearing 15. When the block 14 is withdrawn, thesleeve 6 may be swung about the "pivotal connection of the bracket 5with the arm 3, or the arm 3 may itself be moved vertically to thelimits of the guides 8.

Having described the invention, what .is claimed is:

A breech mechanism for cannon comprising an arm pivoted to the barrelcarriage, a V

bracket pivoted to the arm and carrying a breech block structure, andcooperating

